<span>Rough ER is called rough because it has ribosomes attached to its surface. The double membranes of smooth and rough ER form sacs called cisternae. Protein molecules are synthesized and collected in the cisternal space/lumen. When enough proteins have been synthesized, they collect and are pinched off in vesicles.</span>
Answer:
This should help you understand more about DNA replication
and it also has a picture.
B.Prokaryotic cells do not have a true nucleus or membrane-bound organelles.
